Car Holding Back When Driving Down Hill

Folks, my 3.0TDi A7 has an annoying habit of holding back while I’m pressing the accelerator going down hills. Initially it was just in steep hills, but I’m convinced it’s getrinf worse and does it all the time on any down hills now.

Now I know this is a common thing on VAG cars (from memory it did it the odd time on my wife’s old C7 and my TTS and even my Inlaws Tiguan), but does anyone know the actual mechanics behind this feature and how it works? I’m wondering if there’s a part that could fail or calibration change as such.

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